Doubling Up Every Other Floor Joist

If we use strong enough gussets and fasteners we know that the top and bottom joists will deflect by exactly the same amount when loaded.

Doubling up every other floor joist.

If you double those joists you can span 12 feet 3 inches. I don t think doubling up a 16 2x8 will all of a sudden span 30. Each joist is strong enough to support my weight 175lbs concentrated in a 1 segment of the joist and. Long spans of joists in newer homes may wobble or bounce from foot traffic.

What are they and why use them. 2x4 s actual size spaced 16 on center running the width of the building uninterrupted with the ends resting on top of the wall top plate. I need to put two large velux roof lights 1200 x 1500 in line with each other which means removing two joists and trimming around them. What are double floor joists.

Therefore following static s advice about doubled up strength if i double up all the c24 47x170 joists to make 94x170 it seems that they should be more than adequate. Does this seem correct please. Why would you use a double floor joist. How to make floor joists stronger.

Not even a 12 micro will span that far. The main reason for doubling up floor joists is to double the strength of a single floor joist. After several centuries of service floor joists in older homes may sag or crack. I d like to double my ceiling joists to make my attic space easier to work in for electrical plumbing and for lightweight storage.

This allows you to install continue reading double floor joists.